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Final Report of Vegetation Assessment 2.4.2 Two Ways Indicator Species Analysis (TWINSPAN) Vegetation assessment was carried out in 2006, 2007 and 2008 in different seasons. The year-wise cover data were compiled using spreadsheet in Microsoft® Excel® programme. These values ware then analyzed using software “Two Ways Indicator Species Analysis (TWINSPAN)” as mentioned earlier in Materials & Methods section. A detail of the analysis is provided in Annexure A – III. The results of the analysis are discussed as under: 2.4.2.1 Aeluropus – Arthrocnemum Plant Community (Year 2006) This plant community was observed in 11 out of a total 13 transects. This community was found established on mud flats throughout all creeks. The dominant species of this community were Aeluropus lagopoides followed by Halostachys belangerana. Though there were a total of 67 plant species recorded from this area, yet community was formed by the two species. This community is of halophytic in nature belonging to families Poaceae and Chenopodiaceae and having life forms of Haemicryptophyte and Chamaephyte, respectively. Forage production at the sites represented by this community varied from 24.3 to 219.4 Kg/Ha. Figure 8 – Sites representing Aeluropus – Arthrocnemum Plant Community (Year 2006) 2.4.2.2 Aeluropus – Halostachys Plant Community (Year 2007) This plant community was found during summer 2007. The dominant plant species of this community Aeluropus lagopoides remained the same in spite of the increased number of sampling (13 transects), however, the associated plant species was found Halostachys belangerana which is again a halophytic shrub. This plant community once again represents inter-tidal zone. Replacement of Arthrocnemum indicum with that of Halostachys belangerana is probably result of increased number of transects which covered wider areas and hence based on overall cover the associated species of Halostachys belangerana was found prominent than Arthrocnemum indicum. Forage production at the sites represented by this community varied from 28.8 to 669.2 Kg/Ha. Figure 9 – Sites represented by Aeluropus – Halostachys Plant Community (Year 2007) Indus For All Programme Page 24 of 131
Final Report of Vegetation Assessment 2.4.2.3 Aeluropus lagopoides – Sporopolus virginicus– Arthrocnemum indicum (2008) During Spring 2008, a total of 15 transects were taken to assess the natural vegetation in Keti Bundar area. Two plant communities emerged from the analysis by TWINSPAN. The community Aeluropus lagopoides – Sporopolus virginicus– Arthrocnemum indicum was almost same as that in the year 2006 except addition of another salt tolerant grass Sporopolus virginicus as co-dominant while Arthrocnemum indicum came up as associate. Normally grass species particularly Aeluropus lagopoides is regarded as a pioneer plant in the succession of mangrove forests. Although Sporopolus virginicus is a salt tolerant grass but it is not that hardy as that of Aeluropus lagopoides which occupies the landscape where areas frequently get inundated during high tides. In contrast Sporopolus virginicus is found in areas which have moderate saline water due to mixing of river water into sea water. Forage production at the sites represented by this community varied from 52 to 350 Kg/Ha. Figure 10 – Sites represented by Aeluropus lagopoides – Sporopolus virginicus– Arthrocnemum indicum (2008) 2.4.2.4 Arthrocnemum indicum - Halostachys belangerana - Tamarix indica (2008) This was a second plant community that emerged in Spring 2008 and mostly represents salt pans of inland areas in vicinity to Keti Bundar. Tamarix indica is mostly found along roadside near Keti Bundar town. Over here other halophytic shrubs like Halostachys belangerana are common. This plant community is representative of partially sub-merged area. Forage production at the sites represented by this community varied from 58 to 350 Kg/Ha. Figure 11 – Sites represented by Arthrocnemum indicum - Halostachys belangerana - Tamarix indica (2008) Indus For All Programme Page 25 of 131
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